Flexible Active-Matrix Organic Light-Emitting Diode Display Using Air-Stable Organic Semiconductor of Dinaphtho[2, 3-b: 2′, 3′-f]thieno[3, 2-b]-thiophene

Yoshihide Fujisaki, Yoshiki Nakajima, Tatsuya Takei, Hirohiko Fukagawa, Toshihiro Yamamoto, Hideo Fujikake

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

We developed a flexible active-matrix (AM) organic light-emitting diode (OLED) display driven by an organic thin-film transistor (TFT) (OTFT) using an air-stable organic semiconductor (OSC) of dinaphtho[2, 3-b:2′, 3′-f]thieno[ 3, 2-b]-thiophene (DNTT) for the first time. We employed a low-temperature cross-linkable olefin-type polymer as the gate insulator (GI) and investigated the properties of the interface between DNTT and polymer GI. The top-contact TFT demonstrated a high mobility of up to 0.8 cm2/V.s and a near-zero turn-on voltage. DNTT has a deeper highest occupied molecular orbital level than other OSC materials, and this leads to large contact resistance between the source/drain (S/D) contact and OSC. Surface modifications to the S/D contact were investigated to enable efficient carrier injection to fabricate high-performance bottom-contact TFTs. The short-channel TFT we fabricated exhibited a high hole mobility of 0.5 cm2/V.s, a low subthreshold slope of 0.31, and excellent environmental and operational stability. The DNTT-based TFT also demonstrated good applications to processes with less deterioration. Finally, a 5-in flexible OLED display was successively fabricated by integrating the AM backplane with a phosphorescent OLED device. A high luminescence over 300 cd/m2 was achieved by driving the DNTT-based OTFTs.

Original languageEnglish
Article number6338283
Pages (from-to)3442-3449
Number of pages8
JournalIEEE Transactions on Electron Devices
Volume59
Issue number12
DOIs
Publication statusPublished - 2012 Jan 1
Externally publishedYes

Keywords

  • Flexible display
  • gate insulator (GI)
  • organic semiconductor (OSC)
  • thin-film transistors (TFTs)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Flexible Active-Matrix Organic Light-Emitting Diode Display Using Air-Stable Organic Semiconductor of Dinaphtho[2, 3-b: 2′, 3′-f]thieno[3, 2-b]-thiophene'. Together they form a unique fingerprint.

Cite this